Dental impression flask or tray



F. E. ROACH.

HENTAI. iMPRESSION FLASK 0R TRAY.

, `WPLIclnwu man un zo. |920.

1,367,628. mama Feb. s, 1921.

PATENT OFFICE.

IIl'INIS` E. ROACH, OF CHICAGO, ILLINOIS.

DENTAL IMPRESSION FLASK 0R TRAY.

Specication of Letters Patent.

Patented Feb. 8, 1921.

Application illed May 20, 1920. Serial No. 382,940.

To all 'whom it may concern:

Be it known that I, Finis E. Rollen, a citizen of the United States, residin at Chicago, in thecounty of Cook and tate of Illinois, have invented'certain new and useful Improvements in Dental Impression Flasks or Trays, of which the following is a specification, reference being had to the accompanying drawings, and to the reference characters marked' thereon, which form a part o'this specification.

This invention relates to improvements in dental impression trays and more particularly to a tray adapted to be filled with plastic material for the purpose of taking a mold or impression of a tooth in the mouth of a patient.

In dentistry, `it frequently is desirable to obtain a model or cast of a tooth or other formation in the mouth of a patient. In order to obtain such a cast, it is necessary to Iapply plastic material to the tooth or' other ob]ect inthe mouth to obtain an impression of the same, then remove such plastic material after hardening, and finally to cast a model from the mold thus obtained. In carrying outsuch a process, several diiliculties are encountered. In the lrst lace, due to the inaccessibility of the toot in the patients mouth, it is difiicult to appl the plastic material or to apply it in su cient quantity'toV completely surround the tooth without spilling thesame or rubbing it or its container against;` sensitive 4 arts Y of the mouth. In the second place,vs1nce the tooth frequently is constricted at the neck, it 1s difficult to remove it from the plastic material after-.the impression has been obtained, without defonningfthe molded impression.

Inzthethirdr lace, since the plastic materiales applied to the tooth is soft, it is diicult tohandle the same for the purpose of inserting it into ,the mouth. y

In my improved dental molding tray, I have invented a denice i which overcomes the objections noted above, `With my improved tray it is possibleto hold `a small quantity of plastic material but' i snliicient.v iai amount to `completely surround the tooth or `other object, the impression o fv'wliich is. desired, rsadilyiinsentrsugh plastic, material into the -moiithuwithntsdanger of loss, 'and without infiaooiltlwt with-on injury to. Other parts of the mouth, force the plastic material around the tooth so that a clear, full and distinct impression is obtained, and then remove such plastic material from the tooth without deforming the impression obtained,

giving'a mold in which a perfect casting ma be made.

he objects mentioned above and others will be more readily comprehended as I proceed with my specification.

.In that form of device embodying the principles of the present invention, shown in the accompanying drawings:

Figure 1 is a view in perspective of one form of my improved dental tray with its removable handle attached.

Fig. is a top plan view of the device shown 1n Fig. 1 with a part of the handle broken away.

Fig. 3 is a vertical sectional view of the device shown in Fig. 1, taken centrally and longitudinally of the handle.

Fig. 4 is a vertical sectional view taken in the plane of the line 4-4 of Fig. 3.

Fig. 5 is a plan view of another form of tray, with the handle removed.

ig. 6 is a vertical sectional view on the line 6 6 of Fig. 5.

Fig. 7 is a plan view of the removable handle used in connection with the diii'erent forms of trays.

Fig, 8 is a view in perspective showing the form oftray illustrated in Fig. 1 with the handle removed and the tray opened after an im ression of'a tooth has been taken.

s shown in said drawings, A indicates in eneral a tray formed of two hinged halves and D. B indicates a removable handle adapted to be used in connection with the different forms of trays. F indicates in general, plastic material in the tra in which an impression or mold of a tooth Vis taken.

The form of tray A shown in Fig. 1 with the two halves C and D closed as shown in Figs. 1 and 2,is substantially cubical with one side entirely openand two opposite adjacent sides having circular out away portions as indicated bk 13.

The two halves and D of the tray A, are symmetricaheach being formed by the side `V,face .6, thetwo ,end-,faces 7 (thelatter being cut away at 13 as mentioned heremfom), and the top focq which latter adjacent a hinge E. Each of the faces 5 has two prfgoeting tongues 8 and 1l, the longer tongue being bent outwardly in cylindrical shape to form one half of the hinge E and the shorter tongue 11 being bent inwardly for a purpose to be explained hereinafter. The two tongues 8, 8, of the two halves C and D, each bent in cylindrical form, together with the pin or butt 9 which the encircle, form the complete hinge E. ach of the ends 7 of the two halves C andD also has a Short inwardly projecting ton ue 12 for a purpose to be explained hereina ter.

Tire removable handle B is formed of a short piece of metal substantially rectangular in shape, slightly bent in opposite directions at 18 and 19 to divide it into three parts, namely the handle part 1, the center or offset part 3 and the grip or lock part 2,-- the lock or grip part containing a longitudinal slot 4Q The slot 4 is somewhat narrower than the outside diameter of the cylinders formed by the touffues 8, 8, constituting a part of the hinge but it is of suliicient width to accommodate such tongues when the part 2 is placed on the faces 5 of the tray as shown in Fig. l. This position is accomplished by sliding the hinge E into the slot 4 while holding the part 2 in contact with the faces 5, allowing the widest part of the hinge E to lie on the opposite side of the part 2. It is obvious that when in this position the part 2 of the handle B will prevent the two halves C and D of the tray A from swinging open on the hinge E. When the handle B is removed, however, the two halves of the tray may be opened as shown in Fig. 8.

In Figs. 5 and 6 I have shown another form of tray A. This tray resembles the one shown in Fig. 1 except that two of the ends 7 olf the two halves are bent outwardly to lie in a plane with the sides 6 as indicated by 14. In this construction the two tongues 12 are omitted from the ends thus bent outwal-diy..

The purpose of the inwardly bent tongues 11 and 12 is to part or split the impression material 1when the two halves of 'the tray A are opened on the hinge E. en an impression of a ltooth or other object with an enlarged end or undercut or indentation is taken, it Yis necessary to so part the impression material in order to permit the removal ofthe material from contact with the tooth without deforming the impression.

In the operation of my improved device the handle B is attached to the tray A as shown in Fig. 1, and the tray is lled with a plastic material F, otiany desired kind. The oBpex-'ator fthen holds the device by 'the handle l, inserts the tray into the month and sees the same over the tooth or other ob- )eet ofwhich an impression is desired. It necessary,-the impression material .F may then be tamped into the tray in order to completely surround the tooth or other object. I have shown the device im this position in Fig. 3, in which Gr indicates the tooth of which an impression is desired. The handle B is then removed from the tray A by withdrawing the handle, the slot 4 readily sliding away from contact with the hinge E. The two halves C and D of the tray A. may then be swung open or apart on the hinge the tongues 12 and 11 on the respective halves operating to cause the impression material F to part or spil-it, thus permitting removal of the tray with the impression material from the tooth or oher object of which an impression was obtained, without deforming such impression. I have shown the tray with its impression material after thus 'being removed in Fig. 8. The tray may then be closed and held in this position if desired by again attaching the handle B, so that the two halves of the impression made by the tooth G will lagain be brought together to tomi a mold for casting.

The form of tray shown in Figs. 5 and '6 is especially adapted for obtaining the impression of a tooth that cannot readily be insei-ted into the tray Jfrom the Single open side. The tongues 14 lying in a plane with the sides A6, 6, resnlt in the tray having two open sides so that, if necessary, it may be placed over a tooth by means of emdwise movement.

This tool is of great practical utility, and has no complicated parts to get out of order. Changes may be made in the shape or arrangement of the parts 'without departing from the principle of `my invention, `and therefore I do not desire to have my invention limited or restricted 'to the form illustrated and described, excepting as `set forth in the claims.

I claim as my invention:

l. A dental tray composed of two hinged halves adapted to be 'heldin-their closed sition by means of a removable handle, said handle having a slotad'apted to engage the hinge joining the two halves.

2. A dent-a1 tray formed of two hinged halves each of said halves having an inwardly projecting tongue.

3. A dental tray formed of two hinged halves adapted to be held in their closedposition by means of a removable handle, each of said halves having am inwardly projecting tongue.

4. A dental tray composed of awp sha v d member with two parte hinged; ltoget er, each ol said parts having an inwardly proadapted to' holdvsaid parte to closed position when attached."

5. A dental tray havingtwoeup members hinged together, wrportirmio the im wall stench member te f tion as part of the hinge and a parting ange In testimony that I claim the foregoing as extending inwardly from each of said top my invention I aifix my signature, in the 10 walls. resence of two witnesses, this 14th day of 6. A dental tray having two cup shaped K/Iay, 1920.

members hinged together, each member hav- FINIS E. ROACH.

ing a top, a side and two end walls, and Witnesses:

flanges extending inwardly from the prox- B. L. MACGREGOR,

mate edges of the end walls. TAYLon E. BROWN. 

